Method of making horns for sound-reproducing apparatus



Dec. 27, 1927. 1,654,208

C. H. BIGGS METHOD OF MAKING HORNS FOR SOUND REPRODUCING APPARATUS Filed Ju1y29. 1925 It i) patented Dec. 27, 19357.

PATENT OFFICE.

CHARLES HENRY BIGGS, OF LONDON, ENGLAND.

METHOD OF MAKING HORNS FOR SOUND-REPRODUCING APPARATUS.

Application filer]. July 29, 1926, Serial No. 125,830, and in Great Britain August 12, 1925.

This invention relates to horns for sound reprodueing apparatus and. has ttor its object a simple method for inanutaetiiring same.

lrecording to this invention 1 .inanufaeture sueh horns with strips of paper, fabric or like material.

lhe accompanying drawing illustrates a horn made in aceordance with my invention.

in one manner ol carrying); out this invention eoneerning horns made of paper, I use raripe ol paper gununed or provided on one or both aides with an adl'iesive and spirally ivound into l'lat reels or discs so that they may be drawn axially in the shape of a tapering); tube or sound eonduit. I have found. that when the reels are Wound under proper tension the sound conduits formed in this manner can. be easily bent to any desired eurvatnre. For example when it is desired to form a born with a mouthpiece more or less at right angles to the stem the coil is slightly unwound to obtain the proper tension as it is pulled out and bent whereby even overlapping of the eo11volulions at the bend or bends can be obtained. The overlapping on the greater radius of the bend in less than that on the smaller radius and (fllllfidll'llflllbly transverse reinforcements to and 7) are provided on the outer eirrninlrwenee in order to prevent the overlapping eonvohuiions from becoming dislorted. The diameter of the horn increases uradually from the oounueiwenient oi the sound eonduit to the end (it the flare, the laltlent diameter being that ol the original reel or dist: o ii paper. When the sound oonduit eo fori'ned has been g gix 'en the oorrert lorinrei'piired, it is Wetted and the turns beooine lined in 1 'ion by the adhesive with which the strip is coated. The horn so formed is then provided with a proleetire eoating, that is to say painted, and/or varnished as desired.

It has been found advantageous to coat the born with a mixture of plaster of Paris and glue before painting; and/or varnishing.

A. horn made by the method deserilnid above very light and very cheap; and is admirably suited for internal horns For enrlosed loud speakers or granmphonrs; it is absolutely non-rosommt.

It is obvious that any material. whieh ran be obtained in. strip form, or any 'iabrio ran be used instead of paper.

What I claim and desire to eeeure by Letters Patent is:

lllfetbod of making a horn for grainephones, loud slieali'ers and. the like apparatus, eoneistii'lg in slur-ally Winding stri ia oil material, such as, for example, paper or :iabrie, into fiat reels, the said strips being, gunnned onat least one side, drawing: the said reels axially in the shape of a tapering tube or sound conduit so that the convolutions overlap, the coil. being; reiligg;htl. un- 55 'WOlllld during the drawing operation, bend- :ing the tube thus formed. to the desired curvature, Wetting the tube thus formed so as to fix the turns in por-sition by the adhesive with whieh the strip ii-i (coated, roating; the born with a mixture of plaster of iaris and. glue, plaeleril'igr at leastone strip of laln'ie such as an ordinary medical bandage trausversely ol' the turns where the overlapping is reduoml and providiiug the horn 75 thus l t "med with a prolertivo routing.

In testimony whereof, I aili); my signature. 

